dynamicsash.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

#ifdef __WXMSW__
           && ! wxIsKindOf(win, wxMDIChildFrame)  // not top-level but still a frame
#endif
        )
    {
        win = win->GetParent();
    }

    return win;
}

wxScrollBar *
wxDynamicSashWindowImpl::FindScrollBar(const wxWindow *child, int vert) const
{
    if (m_child[0] == NULL && m_leaf == NULL)
        return NULL;

    if (!m_child[0])
    {
        return m_leaf->FindScrollBar(child, vert);
    }

    wxScrollBar *ret = m_child[0]->FindScrollBar(child, vert);
    if (!ret)
        ret = m_child[1]->FindScrollBar(child, vert);

    return ret;
}

void wxDynamicSashWindowImpl::ConstrainChildren(int px, int py)
{
    wxLayoutConstraints *layout = new wxLayoutConstraints();
    layout->left.SameAs(m_container, wxLeft);
    layout->top.SameAs(m_container, wxTop);
    if (m_split == DSR_HORIZONTAL_TAB)
    {
        layout->right.SameAs(m_container, wxRight);
        layout->height.PercentOf(m_container, wxHeight, py);
    }
    else
    {
        layout->bottom.SameAs(m_container, wxBottom);
        layout->width.PercentOf(m_container, wxWidth, px);
    }
    m_child[0]->m_container->SetConstraints(layout);

    layout = new wxLayoutConstraints();
    layout->right.SameAs(m_container, wxRight);
    layout->bottom.SameAs(m_container, wxBottom);
    if (m_split == DSR_HORIZONTAL_TAB)
    {
        layout->top.Below(m_child[0]->m_container, 1);
        layout->left.SameAs(m_container, wxLeft);
    }
    else
    {
        layout->left.RightOf(m_child[0]->m_container, 1);
        layout->top.SameAs(m_container, wxTop);
    }
    m_child[1]->m_container->SetConstraints(layout);
}

void wxDynamicSashWindowImpl::Unify(int panel)
{
    int other = panel == 0 ? 1 : 0;

    if (m_child[panel]->m_leaf)
    {
        wxDynamicSashWindowImpl *child[2];

        child[0] = m_child[0];
        child[1] = m_child[1];

        m_child[0] = m_child[1] = NULL;

        m_leaf = new wxDynamicSashWindowLeaf(this);
        m_leaf->Create();
        m_leaf->m_child = child[panel]->m_leaf->m_child;

        m_leaf->m_vscroll->SetScrollbar(child[panel]->m_leaf->m_vscroll->GetThumbPosition(),
                                        child[panel]->m_leaf->m_vscroll->GetThumbSize(),
                                        child[panel]->m_leaf->m_vscroll->GetRange(),
                                        child[panel]->m_leaf->m_vscroll->GetPageSize());
        m_leaf->m_hscroll->SetScrollbar(child[panel]->m_leaf->m_hscroll->GetThumbPosition(),
                                        child[panel]->m_leaf->m_hscroll->GetThumbSize(),
                                        child[panel]->m_leaf->m_hscroll->GetRange(),
                                        child[panel]->m_leaf->m_hscroll->GetPageSize());
        m_add_child_target = NULL;
        wxDynamicSashReparentEvent event(m_leaf);
        m_leaf->ProcessEvent(event);

        delete child[0];
        delete child[1];

        m_split = DSR_NONE;

        wxDynamicSashUnifyEvent unify(m_leaf->m_child);
        m_leaf->m_child->ProcessEvent(unify);
    }
    else
    {
        m_split = m_child[panel]->m_split;

        delete m_child[other];

        wxDynamicSashWindowImpl *child_panel = m_child[panel];
        m_child[0] = child_panel->m_child[0];
        m_child[1] = child_panel->m_child[1];

        m_child[0]->m_parent = this;
        m_child[1]->m_parent = this;

        m_add_child_target = NULL;
        m_child[0]->m_container->Reparent(m_container);
        m_child[1]->m_container->Reparent(m_container);

        child_panel->m_child[0] = child_panel->m_child[1] = NULL;
        delete child_panel;

        wxSize size = m_container->GetSize();
        wxSize child_size = m_child[0]->m_container->GetSize();

        ConstrainChildren(child_size.GetWidth() * 100 / size.GetWidth(),
                            child_size.GetHeight() * 100 / size.GetHeight());

        m_container->Layout();
    }
}

void wxDynamicSashWindowImpl::Split(int px, int py)
{

    m_add_child_target = NULL;

    m_child[0] = new wxDynamicSashWindowImpl(m_window);
    m_child[0]->m_container = new wxWindow(m_container, wxID_ANY);
    m_child[0]->m_parent = this;
    m_child[0]->m_top = m_top;
    m_child[0]->Create();
    if (m_leaf->m_child)
    {
        m_leaf->m_child->Reparent(m_container);
        m_child[0]->AddChild(m_leaf->m_child);
    }

    m_child[1] = new wxDynamicSashWindowImpl(m_window);
    m_child[1]->m_container = new wxWindow(m_container, wxID_ANY);
    m_child[1]->m_parent = this;
    m_child[1]->m_top = m_top;
    m_child[1]->Create();

    m_split = m_dragging;
    ConstrainChildren(px, py);

    m_top->m_add_child_target = m_child[1];
    wxDynamicSashSplitEvent split(m_child[0]->m_leaf->m_child);
    m_child[0]->m_leaf->m_child->ProcessEvent(split);

    m_child[0]->m_leaf->m_vscroll->SetScrollbar(m_leaf->m_vscroll->GetThumbPosition(),
                                                m_leaf->m_vscroll->GetThumbSize(),
                                                m_leaf->m_vscroll->GetRange(),
                                                m_leaf->m_vscroll->GetPageSize());
    m_child[0]->m_leaf->m_hscroll->SetScrollbar(m_leaf->m_hscroll->GetThumbPosition(),
                                                m_leaf->m_hscroll->GetThumbSize(),
                                                m_leaf->m_hscroll->GetRange(),
                                                m_leaf->m_hscroll->GetPageSize());
    m_child[1]->m_leaf->m_vscroll->SetScrollbar(m_leaf->m_vscroll->GetThumbPosition(),
                                                m_leaf->m_vscroll->GetThumbSize(),
                                                m_leaf->m_vscroll->GetRange(),
                                                m_leaf->m_vscroll->GetPageSize());
    m_child[1]->m_leaf->m_hscroll->SetScrollbar(m_leaf->m_hscroll->GetThumbPosition(),
                                                m_leaf->m_hscroll->GetThumbSize(),
                                                m_leaf->m_hscroll->GetRange(),
                                                m_leaf->m_hscroll->GetPageSize());
    delete m_leaf;
    m_leaf = NULL;

    m_container->Layout();
}


/*  This code is called when you finish resizing a view by dragging the
    corner tab, but I think this implementation is lousy and will surprise
    the user more often than it will do what they are trying to do.  What
    I really need to be doing here is do a rewrite such that *no* sashes
    move except the ones immediately to the bottom and right of this window,
    and handle the case where you resize a window larger than it's neighbors
    by destroying the neighbors.

    But this will do for now.  */
void wxDynamicSashWindowImpl::Resize(int x, int y)
{
    wxDynamicSashWindowImpl *h_parent = FindParent(DSR_BOTTOM_EDGE);
    wxDynamicSashWindowImpl *v_parent = FindParent(DSR_RIGHT_EDGE);
    int h_unify = -1;
    int v_unify = -1;
    wxWindow *frame = FindFrame();

    if (x < 0)
        x = 0;
    if (y < 0)
        y = 0;

    if (h_parent)
    {
        m_container->ClientToScreen(NULL, &y);
        h_parent->m_container->ScreenToClient(NULL, &y);

        int py = (int)((y * 100) / h_parent->m_container->GetSize().GetHeight() + 0.5);

        if (py < 10)
        {
            wxDynamicSashWindowImpl *ho_parent = FindParent(DSR_TOP_EDGE);

            if (ho_parent)
            {
                if (FindUpperParent(h_parent, ho_parent) == ho_parent)
                {
                    h_unify = 1;
                }
                else
                {
                    py = (int)((ho_parent->m_child[0]->m_container->GetSize().GetHeight() * 100)
                                / h_parent->m_container->GetSize().GetHeight() + 0.5);
                    h_parent->m_child[0]->m_container->GetConstraints()->height.PercentOf(
                            h_parent->m_container, wxHeight, py);

                    h_parent = ho_parent;
                    h_unify = 0;
                }
            }
            else
            {
                h_unify = 1;
            }
        }
        else if (py > 90)
        {
            h_unify = 0;
        }
        else
        {
            h_parent->m_child[0]->m_container->GetConstraints()->height.PercentOf(
                    h_parent->m_container, wxHeight, py);
            h_parent->m_container->Layout();
        }
    }
    else
    {
        int do_resize = 1;
        h_parent = FindParent(DSR_TOP_EDGE);

        if (h_parent)
        {
            int py = (int)((y * 100) /
                        (h_parent->m_container->GetSize().GetHeight() +
                                y - m_container->GetSize().GetHeight()) + 0.5);

            if (py < 10)
                h_unify = 0;
        }
        else if (y < 64)
        {
            do_resize = 0;
        }

        if (do_resize)
        {
            wxSize size = frame->GetSize();
            frame->SetSize(size.GetWidth(), size.GetHeight() + y - m_container->GetSize().GetHeight());
        }
    }

    if (v_parent)
    {
        m_container->ClientToScreen(&x, NULL);
        v_parent->m_container->ScreenToClient(&x, NULL);

        int px = (int)((x * 100) / v_parent->m_container->GetSize().GetWidth() + 0.5);

        if (px < 10)
        {
            wxDynamicSashWindowImpl *vo_parent = FindParent(DSR_LEFT_EDGE);

            if (vo_parent)
            {
                if (FindUpperParent(v_parent, vo_parent) == vo_parent)
                {
                    v_unify = 1;
                }
                else
                {
                    px = (int)((vo_parent->m_child[0]->m_container->GetSize().GetWidth() * 100)
                                / v_parent->m_container->GetSize().GetWidth() + 0.5);
                    v_parent->m_child[0]->m_container->GetConstraints()->width.PercentOf(
                            v_parent->m_container, wxWidth, px);

                    v_parent = vo_parent;
                    v_unify = 0;
                }
            }
            else
            {
                v_unify = 1;
            }
        }
        else if (px > 90)
        {
            v_unify = 0;
        }
        else
        {
            v_parent->m_child[0]->m_container->GetConstraints()->width.PercentOf(
                    v_parent->m_container, wxWidth, px);
            v_parent->m_container->Layout();
        }
    }
    else
    {
        int do_resize = 1;
        v_parent = FindParent(DSR_LEFT_EDGE);

        if (v_parent)
        {
            int px = (int)((x * 100) /
                        (v_parent->m_container->GetSize().GetWidth() +
                                x - m_container->GetSize().GetWidth()) + 0.5);

            if (px < 10)
                v_unify = 0;
        }
        else if (x < 64)
        {
            do_resize = 0;
        }

        if (do_resize)
        {
            wxSize size = frame->GetSize();
            frame->SetSize(size.GetWidth() + x - m_container->GetSize().GetWidth(), size.GetHeight());
        }
    }

    if (h_unify != -1 && v_unify != -1)
    {
        wxDynamicSashWindowImpl *parent = FindUpperParent(h_parent, v_parent);

        if (parent == h_parent)
        {
            h_parent->Unify(h_unify);
        }
        else
        {
            v_parent->Unify(v_unify);
        }
    }
    else if (h_unify != -1)
    {
        h_parent->Unify(h_unify);
    }
    else if (v_unify != -1)
    {
        v_parent->Unify(v_unify);
    }
}


void wxDynamicSashWindowImpl::OnSize(wxSizeEvent &event)
{
    m_container->Layout();

    if (m_leaf)
        m_leaf->OnSize(event);
}

void wxDynamicSashWindowImpl::OnPaint(wxPaintEvent &event)
{
    if (m_leaf)
        m_leaf->OnPaint(event);
    else
    {
        wxPaintDC dc(m_container);
        dc.SetBackground(wxBrush(m_container->GetBackgroundColour(), wxSOLID));
        dc.Clear();
    }
}

void wxDynamicSashWindowImpl::OnMouseMove(wxMouseEvent &event)
{
    if (m_dragging)
    {
        DrawSash(m_drag_x, m_drag_y);
        m_drag_x = event.m_x;  m_drag_y = event.m_y;
        DrawSash(m_drag_x, m_drag_y);
    }
    else if (m_leaf)
    {
        m_leaf->OnMouseMove(event);
    }
}

void wxDynamicSashWindowImpl::OnLeave(wxMouseEvent &event)
{
    if (m_leaf)
        m_leaf->OnLeave(event);
}

void wxDynamicSashWindowImpl::OnPress(wxMouseEvent &event)
{
    if (m_leaf)
    {
        m_leaf->OnPress(event);
    }
    else
    {
        m_dragging = m_split;
        m_drag_x = event.m_x;
        m_drag_y = event.m_y;
        DrawSash(m_drag_x, m_drag_y);
        m_container->CaptureMouse();
    }
}

void wxDynamicSashWindowImpl::OnRelease(wxMouseEvent &event)
{
    if ((m_dragging == DSR_CORNER) &&
        (m_window->GetWindowStyle() & wxDS_DRAG_CORNER) != 0)
    {
        DrawSash(m_drag_x, m_drag_y);
        m_container->ReleaseMouse();

        Resize(event.m_x, event.m_y);

        m_dragging = DSR_NONE;
    }
    else if (m_dragging)
    {
        DrawSash(m_drag_x, m_drag_y);
        m_container->ReleaseMouse();

        wxSize size = m_container->GetSize();
        int px = (int)((event.m_x * 100) / size.GetWidth() + 0.5);
        int py = (int)((event.m_y * 100) / size.GetHeight() + 0.5);

        if ((m_dragging == DSR_HORIZONTAL_TAB && py >= 10 && py <= 90)
                    || (m_dragging == DSR_VERTICAL_TAB && px >= 10 && px <= 90))
        {
            if (m_child[0] == NULL)
            {
                Split(px, py);
            }
            else
            {
                /*  It would be nice if moving *this* sash didn't implicitly move
                    the sashes of our children (if any).  But this will do.  */
                wxLayoutConstraints *layout = m_child[0]->m_container->GetConstraints();
                if (m_split == DSR_HORIZONTAL_TAB)
                {
                    layout->height.PercentOf(m_container, wxHeight, py);
                }
                else
                {
                    layout->width.PercentOf(m_container, wxWidth, px);
                }
                m_container->Layout();
            }
        }
        else
        {
            if (m_child[0] != NULL)
            {
                if ((m_dragging == DSR_HORIZONTAL_TAB && py <= 10)
                        || (m_dragging == DSR_VERTICAL_TAB && px <= 10))
                {
                    Unify(1);
                }
                else
                {
                    Unify(0);
                }
            }
        }

        wxCursor cursor;
        if (m_split == DSR_HORIZONTAL_TAB)
            cursor = wxCursor(wxCURSOR_SIZENS);
        else if (m_split == DSR_VERTICAL_TAB)
            cursor = wxCursor(wxCURSOR_SIZEWE);
        else
            cursor = wxCursor(wxCURSOR_ARROW);